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Heuristic Evaluation is a usability inspection method where experts use heuristics, or rules of thumb, to identify usability problems in user interface design.

Human Factors is the study of how humans behave physically and psychologically in relation to particular environments, products, or services.

Usability is a measure of how easy and intuitive a system is to use, including its efficiency, effectiveness, and satisfaction.

Fitts' Law models the time required to move to a target area, given the distance to and size of the target:

Gesture Recognition refers to interpreting human gestures via mathematical algorithms to interact with a computer system.

Affordance refers to the properties of an object that suggest how it can be used. A button affording to be pushed is an example.

Direct Manipulation is an interaction style where users directly interact with objects on the screen as if they were manipulating physical objects.

Natural User Interface (NUI) is a user interface designed to be as intuitive as possible, mimicking natural human behavior and motion.

Touchscreen Gestures are inputs performed on touch-sensitive screens and can include tapping, swiping, pinching, and stretching.

Think Aloud Protocol involves users verbalizing their thought processes as they interact with a system to uncover usability issues and insights into user behavior.

Contextual Inquiry is a user-centered design research method that involves observing and interviewing users in their natural environment.